No, ice will not hurt the system but it is not necessary as the difference in thermal sensation will be minimal.
The sensor buoy is attached to the water tank and monitors the water level. If the tank is full and the low water warning light remains on, check that the sensor is inserted correctly in the reservoir with the green dot facing up. If the sensor is inserted correctly and the light remains on it should be replaced.
The return pump is located in the tray and returns excess water to the reservoir.
We recommend replacing the injection pump every 12 months.
More information can be found in the maintenance section of the owner’s manual.